remove Related to in inline, add it to Profile, spacing nits

lms/static/sass/discussion/_discussion.scss

@@ -202,10 +202,6 @@ body.discussion {
     }
   }
 
-  .responses li header {
-    margin-bottom: $baseline;
-  }
-
   blockquote {
     background: $gray-l5;
     border-radius: $forum-border-radius;

lms/static/sass/discussion/_layouts.scss

@@ -34,6 +34,10 @@
         padding: 0;
         font-size: $forum-base-font-size;
     }
+
+    .response-count {
+        @include margin-right($baseline / 4);
+    }
 }
 
 .discussion-column {

lms/static/sass/discussion/elements/_navigation.scss

@@ -191,7 +191,7 @@
     }
 
     .thread-preview-body {
-        margin-top: $baseline / 4;
+        @include margin($baseline / 4, $baseline, 0, 0);
         color: $forum-color-response-count;
         font-size: $forum-small-font-size;
         overflow: hidden;

lms/static/sass/discussion/views/_thread.scss

@@ -14,7 +14,7 @@
     padding: 0 ($baseline/2);
 
     .wrapper-post-header {
-        padding-bottom: 0;
+        padding-bottom: $baseline;
     }
 
     .post-header-content {